new file button - dont work

# make a new file
    def on_btn_new_clicked(self, widget, data=None):
        tempfilename = os.path.join(_TEMPDIR, "temp.ngc")
        content = self.get_ini_info.get_RS274_start_code()
        if content == None:
            content = " "
        content += "\n\n\n\nM2"
        gcodefile = open(tempfilename, "w")
        gcodefile.write(content)
        gcodefile.close()
        if self.widgets.lbl_program.get_label() == tempfilename:
            self.widgets.hal_action_reload.emit("activate")
        else:
            self.widgets.hal_action_open.load_file(tempfilename)
            # self.command.program_open(tempfilename)
        self.widgets.gcode_view.grab_focus()
        self.widgets.btn_save.set_sensitive(False)

    def on_tbtn_optional_blocks_toggled(self, widget, data=None):
        opt_blocks = widget.get_active()
        self.command.set_block_delete(opt_blocks)
        self.prefs.putpref("blockdel", opt_blocks)
        self.widgets.hal_action_reload.emit("activate")